Euro Posted March 16, 2007 Report Posted March 16, 2007 On the new GP, the cooling fans are on all the time. I turn the car on, and a few seconds later the fans turn on. No problems or anything, i just thought it was weird. Anybody know what could be wrong? Quote
1990lumina Posted March 17, 2007 Report Posted March 17, 2007 Still getting heat?? I'm sure other then pre maturely wearing out your fan motors and loading the electrical system you run the risk of over cooling when it's really cold outside. I think someone had a similar issue with a GP like yours a few months ago..I'd search it for you but I doubt I'd find it..sorry man! Quote
RJansen658 Posted March 17, 2007 Report Posted March 17, 2007 The 3100's have two temp sensors, one for the guage inside, and one for the ECM to sense when to turn on the fans. It sounds like the ECM's sensor if either fried, disconnected, or grounded out. All 3 of these scenarios will turn the fan on constant, but only 2 of them will turn on the SES light. Quote
Crazy K Posted March 17, 2007 Report Posted March 17, 2007 I looked over a neighbors new 93 lumina once. discovered that someone had placed jumper wires beneath the fan relays. The 3100's have two temp sensors, one for the guage inside, and one for the ECM to sense when to turn on the fans. It sounds like the ECM's sensor if either fried, disconnected, or grounded out. All 3 of these scenarios will turn the fan on constant, but only 2 of them will turn on the SES light. only on 95 down. the 96+ 3100s have a three wire sensor. could be a bad sensor or.... my 93 vert does this when you start it after having run earlier the day. what engine??? Quote
jeremy Posted March 17, 2007 Report Posted March 17, 2007 it a l36....so all the talk about 3100s is meaningless Quote
RJansen658 Posted March 17, 2007 Report Posted March 17, 2007 The 3100's have two temp sensors, one for the guage inside, and one for the ECM to sense when to turn on the fans. It sounds like the ECM's sensor if either fried, disconnected, or grounded out. All 3 of these scenarios will turn the fan on constant, but only 2 of them will turn on the SES light. only on 95 down. the 96+ 3100s have a three wire sensor. could be a bad sensor or.... my 93 vert does this when you start it after having run earlier the day. I didn't know/notice it changed in 96... still could be a bad sensor or wiring. Now that CrazyK mentioned the relay, it could be a stuck relay or jumpered. Best way to tell would be to scan it with a scan tool capable of monitoring the sensor. And besides premature fan death, the temp sensor is used by the ECM for a lot of things, a LOT... with an open or grounded sensor, the ECM will be doing a lot of things out of adjustment, maybe not even entering closed loop. Quote
Euro Posted March 17, 2007 Author Report Posted March 17, 2007 it a l36....so all the talk about 3100s is meaningless um...yeah lol Quote
RJansen658 Posted March 17, 2007 Report Posted March 17, 2007 it a l36....so all the talk about 3100s is meaningless um...yeah lol nah not really.... either way it will have the same type of system. The sensor may be mounted somewhere else, but the wiring will work the same. Quote
99RegalGS Posted March 17, 2007 Report Posted March 17, 2007 You work today Matt? I'll be in by Dikran. If you're close I could take a quick look at it. Quote
Euro Posted March 19, 2007 Author Report Posted March 19, 2007 ok so now the SES light came on, but the car still runs fine. Getting this damned sensor or relay fixed Quote
terryk2003 Posted March 19, 2007 Report Posted March 19, 2007 did you scan the SES light!?...it MIGHT be coming on for your coolant temp being too cold (since your fans are running all the time) Quote
SigEpCutlass Posted March 19, 2007 Report Posted March 19, 2007 Would a bad CTS (Coolant Temp Sens) cause the SES light to come on? If that sens is on the fritz and sending a bad or wrong signal, it could be the reason why the fans are running too much. DUH...repost sorry... Quote
Euro Posted March 19, 2007 Author Report Posted March 19, 2007 that does sound about right. It's getting looked at tomorrow. Warranty FTW!!! Quote
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